Method and apparatus for transmitting multi-tone signals

Abstract

The embodiment of the present application provides a multi-tone signal sending method and device. The method comprises the following steps: generating a first multi-tone signal, the first multi-tone signal comprising N single-tone signals, the amplitude values of each single-tone signal being the same, the initial phases of at least two single-tone signals in the N single-tone signals being the same, or the absolute values of the initial phases of at least two single-tone signals in the N single-tone signals being the same, N being an integer greater than or equal to 2; and sending the first multi-tone signal. The method disclosed by the present application can improve the average power of multi-tone signal sending, and further improve the transmission distance or coverage range of the multi-tone signal.

Description

Technical Field

[0001] This application relates to the field of communications, and more specifically, to a method and apparatus for transmitting multi-tone signals. Background Technology

[0002] Currently, the Bluetooth Special Interest Group (Bluetooth SIG) supports Bluetooth protocols for Angle of Arrival (AoA) and Angle of Departure (AoD), improving indoor positioning accuracy by utilizing directional information from Bluetooth Low Energy (BLE) signals. However, AoA / AoD and multi-carrier phase difference (MCPD) measurements are performed by transmitting a single tone (or a single carrier) signal. Each measurement can only measure the phase of a specific frequency within the entire Industrial Scientific Medical Band (ISM), resulting in a lengthy measurement time for the entire band. Utilizing multi-tone signals for phase measurement in AoA / AoD or MCPD ranging can significantly reduce overall measurement time and power consumption.

[0003] However, considering the upper limit of the power amplifier (PA) of the transmitting device, and the limitation of the peak-to-average-power ratio (PAPR) of the multi-tone signal on the average power of the transmitted multi-tone signal, improving the average power of the transmitted multi-tone signal is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a method and apparatus for transmitting multi-tone signals. By designing different initial phases of the multi-tone signals, the average power of the multi-tone signal transmission can be improved, thereby increasing the transmission distance or coverage of the multi-tone signal.

[0005] Firstly, a method for transmitting multi-tone signals is provided. This method can be executed by a receiving device, or by a chip or circuit used in the receiving device; this application does not limit the scope of the method. For ease of description, the following explanation will use the example of execution by a receiving device.

[0006] The method includes: generating a first multi-tone signal, the first multi-tone signal comprising N single-tone signals, each single-tone signal having the same amplitude value, at least two of the N single-tone signals having the same initial phase, or at least two of the N single-tone signals having the same absolute value of the initial phase, where N is an integer greater than or equal to 2; and transmitting the first multi-tone signal.

[0007] According to the scheme provided in this application, by changing the initial phase to design different multi-tone signals, the PAPR of the signal is made as small as possible, thereby increasing the average power of the multi-tone signal transmission, which is beneficial to increasing the transmission distance or coverage of the multi-tone signal.

[0008] It should be understood that, compared to traditional multi-tone signals with an initial phase of 0 by default, the multi-tone signal provided in this application has an increased average transmission power, thereby increasing the signal transmission distance (or coverage). For example, if two devices use multi-tone signals with an initial phase of 0, they may be unable to perform multi-tone ranging or multi-tone AoA / AoD measurements due to the weak received signal.

[0009] For example, with N=4, the initial phase of the first polyphonic signal can be 1.81, 0, 0 and 1.81; or, the initial phase of the first polyphonic signal can also be 4.47, 0, 0 and 4.47, or, the initial phase of the first polyphonic signal can also be -0.08, -0.63, 0.63 and 3.70, etc., and this application does not specifically limit it in this way.

[0010] It should be noted that the unit of phase can be radians or degrees. For ease of understanding, this application uses radians to represent the initial phase of each monotone signal in a polyphonic signal. Of course, it is not ruled out that the initial phase can be represented by degrees. For the sake of simplicity, we will not go into details.

[0011] In one possible implementation, based on the fact that at least two monotone signals have the same initial phase, the initial phase of each monotone signal in the first polytone signal is increased by the same initial phase Δφ, that is, each point of each monotone signal on the IQ plane is rotated counterclockwise by Δφ, and the corresponding polytone signal is also rotated counterclockwise by Δφ on the IQ plane. This rotation does not change the amplitude of the polytone signal, so the rotated polytone signal can also obtain the optimal PAPR.

[0012] For example, with N=4, the initial phases of each monotone signal in the first polyphonic signal, φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81, are all rotated counterclockwise by Δφ = π / 6 = 0.52, resulting in initial phases of φ1 = 2.33, φ2 = 0.52, φ3 = 0.52, φ4 = 2.33. It should be understood that these two sets of initial phase combinations correspond to the same PAPR.

[0013] In another possible implementation, based on the fact that at least two monotone signals have the same initial phase, each monotone signal in the first polytone signal is shifted by Δt on the time axis, where Δt is an arbitrary value. The corresponding polytone signal is also shifted by Δt on the time axis, which is equivalent to increasing the initial phase of each monotone signal. This shift does not affect the maximum amplitude of the polyphonic signal, therefore the shifted polyphonic signal can also achieve the optimal PAPR.

[0014] For example, with N=4, shifting the initial phases φ1 = 1.81, φ2 = 0, φ3 = 0, and φ4 = 1.81 in the first polyphonic signal to the left by Δt = 0.2µs on the time axis results in initial phases of φ1 = -0.08, φ2 = -0.63, φ3 = 0.63, and φ4 = 3.70. It should be understood that these two sets of initial phase combinations correspond to the same PAPR.

[0015] In another possible implementation, based on the fact that at least two monotone signals have the same initial phase, each point of each monotone signal on the IQ plane is rotated counterclockwise by Δφ, and each monotone signal is translated Δt on the time axis. This also does not affect the maximum amplitude of the multitone signal; therefore, the translated multitone signal can also achieve the optimal PAPR. It should be noted that the order of rotation and translation of the multitone signal is not specifically limited.

[0016] For example, with N=4, the initial phases φ1 = 1.81, φ2 = 0, φ3 = 0, and φ4 = 1.81 of each monotone signal in the first polytone signal are rotated counterclockwise by Δφ = π / 6 = 0.52, and then shifted to the left on the time axis by Δt = 0.2µs. The resulting initial phases correspond to the same PAPR as the original initial phases.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, at least two single-tone signals with the same initial phase are symmetrical about the center frequency.

[0018] For example, N=4, the initial phase of the first single-tone signal is φ1 = 1.81, the initial phase of the second single-tone signal is φ2 = 0, the initial phase of the third single-tone signal is φ3 = 0, and the initial phase of the fourth single-tone signal is φ4 = 1.81. Correspondingly, the frequency of the first single-tone signal is -1.5MHz, the frequency of the second single-tone signal is -0.5MHz, the frequency of the third single-tone signal is 0.5MHz, and the frequency of the fourth single-tone signal is 1.5MHz. That is, the first and fourth single-tone signals are symmetrical about the center frequency, and the second and fourth single-tone signals are also symmetrical about the center frequency.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, when N=3, the initial phases of the first monotone signal and the third monotone signal are the same, the frequency of the first monotone signal is the smallest, and the frequency of the third monotone signal is the largest.

[0020] For example, N=3, the initial phase of the first and third monotone signals can be 0, and the initial phase of the second monotone signal can be 1.57.

[0021] In conjunction with the first aspect, in some implementations of the first aspect, when N=4, the initial phases of the first and fourth monotone signals are the same, and / or the initial phases of the second and third monotone signals are the same, the frequency of the first monotone signal is the smallest, the frequency of the fourth monotone signal is the largest, and the second monotone signal is greater than the first monotone signal and less than the third monotone signal.

[0022] For example, N=4, the frequency of the first single-tone signal is -1.5MHz, the frequency of the second single-tone signal is -0.5MHz, the frequency of the third single-tone signal is 0.5MHz, and the frequency of the fourth single-tone signal is 1.5MHz. Correspondingly, the initial phase of the first single-tone signal and the fourth single-tone signal can be 1.81, and the initial phase of the second single-tone signal and the third single-tone signal can be 0.

[0023] In conjunction with the first aspect, in some implementations of the first aspect, when N=5, the initial phases of the first and fifth monotone signals are the same, the initial phases of the second and fourth monotone signals are the same, the frequency of the first monotone signal is the smallest, and the frequency of the fifth monotone signal is the largest.

[0024] For example, N=5, the initial phase of the first and fifth monotone signals can be 1.05, the initial phase of the second and fourth monotone signals can be 0, and the initial phase of the third monotone signal can be 3.01.

[0025] In conjunction with the first aspect, in some implementations of the first aspect, when N=6, the initial phases of the first and sixth single-tone signals are the same, the initial phases of the second and fifth single-tone signals are the same, the initial phases of the third and fourth single-tone signals are the same, the frequency of the first single-tone signal is the smallest, and the frequency of the sixth single-tone signal is the largest.

[0026] For example, N=6, the initial phase of the first and sixth monotone signals can be 5.00, the initial phase of the second and fifth monotone signals can be 3.67, and the initial phase of the third monotone signal can be 0.

[0027] In conjunction with the first aspect, in some implementations of the first aspect, when N=7, the initial phases of the first and seventh monotone signals are the same, the initial phases of the second and sixth monotone signals are the same, the initial phases of the third and fifth monotone signals are the same, the frequency of the first monotone signal is the smallest, and the frequency of the seventh monotone signal is the largest.

[0028] For example, N=7, the initial phase of the first and seventh monotone signals can be 3.14, the initial phase of the second and sixth monotone signals can be 4.71, the initial phase of the third and fifth monotone signals can be 0, and the initial phase of the fourth monotone signal can be 4.71.

[0029] In conjunction with the first aspect, in some implementations of the first aspect, when N=8, one or more of the following conditions are met: the initial phases of the first and eighth single-tone signals are the same; the initial phases of the second and seventh single-tone signals are the same; the initial phases of the third and sixth single-tone signals are the same; or, the initial phases of the fourth and fifth single-tone signals are the same; the frequency of the first single-tone signal is the smallest; the frequency of the eighth single-tone signal is the largest; the frequency of the third single-tone signal is greater than the frequency of the second single-tone signal and less than the frequency of the fourth single-tone signal; the frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than the frequency of the sixth single-tone signal; and the frequency of the sixth single-tone signal is less than the frequency of the seventh single-tone signal.

[0030] For example, N=8, the initial phase of the first and eighth monotone signals can be 5.40, the initial phase of the second and seventh monotone signals can be 3.84, the initial phase of the third and sixth monotone signals can be 0.91, and the initial phase of the fourth and fifth monotone signals can be 0.

[0031] In conjunction with the first aspect, in some implementations of the first aspect, when N=4, for the PAPR of the signal to be less than or equal to 2 dB, the initial phases of the corresponding N monotone signals satisfy any of the following:

[0032] φ2=φ3=0, 1.59 ≤ φ1<1.86, φ4 ≥ - φ1 + 3.57, and φ4 ≤ - φ1 4 / 9 +2.69;

[0033] φ2=φ3=0, 1.86 ≤ φ1 ≤ 1.98, φ4 ≥ - φ1 + 3.57, and φ4 ≤ - φ1 9 / 4+ 6.04;

[0034] φ2=φ3=0, 4.3 ≤ φ1<4.42, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 9 / 4 +14.36; or,

[0035] φ2=φ3=0, 4.42 ≤ φ1<4.69, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 4 / 9 +6.38;

[0036] Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

[0037] In conjunction with the first aspect, in some implementations of the first aspect, when N=4, for the PAPR of the signal to be less than or equal to 2.5 dB, the initial phases of the corresponding N monotone signals satisfy any of the following:

[0038] φ2=φ3=0, 0 ≤ φ1<2.05, φ4 ≥ - φ1 + π, and φ4 ≤ - φ1 0.53 + π;

[0039] φ2=φ3=0, 2.05 ≤ φ1 ≤ π, φ4 ≥ - φ1 + π, and φ4 ≤ - φ1 1.88 +5.9;

[0040] φ2=φ3=0, π ≤ φ1<4.23, φ4 ≤ - φ1 + 9.42, and φ4 ≥ - φ1 1.88 + 12.18; or,

[0041] φ2=φ3=0, 4.23 ≤ φ1 ≤ 2π, φ4 ≤ - φ1 + 9.42, and φ4 ≥ - φ1 0.53 +6.47;

[0042] Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

[0043] In conjunction with the first aspect, in some implementations of the first aspect, when N=4, for the PAPR of the signal to be less than or equal to 3 dB, the initial phases of the corresponding N monotone signals satisfy any of the following:

[0044] φ2=φ3=0, 0 ≤ φ1<2.3, φ4 ≥ - φ1 + 2.92, and φ4 ≤ - φ1 0.46 +3.36;

[0045] φ2=φ3=0, 2.3 ≤ φ1<2.92, φ4 ≥ - φ1 + 2.92, and φ4 ≤ - φ1 2.17 +7.29;

[0046] φ2=φ3=0, 2.92 ≤ φ1<3.36, φ4 ≥ 0, and φ4 ≤ - φ1 2.17 + 7.29;

[0047] φ2=φ3=0, 2.92 ≤ φ1<3.36, φ4 ≤ 2π, and φ4 ≥ - φ1 2.17 + 12.62;

[0048] φ2=φ3=0, 3.36 ≤ φ1<3.98, φ4 ≤ - φ1 + 9.64, and φ4 ≥ - φ1 2.17 + 12.62; or,

[0049] φ2=φ3=0, 3.98 ≤ φ1<2π, φ4 ≤ - φ1 + 9.64, and φ4 ≥ - φ1 0.46 +5.81;

[0050] Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

[0051] In conjunction with the first aspect, in some implementations of the first aspect, the frequency interval between any two adjacent monotone signals among the N monotone signals is the same.

[0052] For example, N=4, the frequency of the first monotone signal is -1.5 MHz, the frequency of the second monotone signal is -0.5 MHz, the frequency of the third monotone signal is 0.5 MHz, and the frequency of the fourth monotone signal is 1.5 MHz. Then, the frequency interval between any two adjacent monotone signals among the four monotone signals is the same.

[0053] In conjunction with the first aspect, in some implementations of the first aspect, when N=4, the frequency interval between any two adjacent monotone signals among the N monotone signals is 1MHz.

[0054] For example, N=4, the frequency of the first monotone signal is -1.5 MHz, the frequency of the second monotone signal is -0.5 MHz, the frequency of the third monotone signal is 0.5 MHz, and the frequency of the fourth monotone signal is 1.5 MHz; or, the frequency of the first monotone signal is -1 MHz, the frequency of the second monotone signal is 0 MHz, the frequency of the third monotone signal is 1 MHz, and the frequency of the fourth monotone signal is 2 MHz.

[0055] In conjunction with the first aspect, in some implementations of the first aspect, when N=4, the frequency interval between any two adjacent monotone signals among the N monotone signals is 2MHz.

[0056] For example, N=4, the frequency of the first monotone signal is -3MHz, the frequency of the second monotone signal is -1MHz, the frequency of the third monotone signal is 1MHz, and the frequency of the fourth monotone signal is 3MHz.

[0057] In a second aspect, a multi-tone signal transmitting device is provided, comprising: a processing unit for generating a first multi-tone signal, the first multi-tone signal comprising N single-tone signals, each single-tone signal having the same amplitude value, at least two of the N single-tone signals having the same initial phase, or at least two of the N single-tone signals having the same absolute value of the initial phase, where N is an integer greater than or equal to 2; and a transceiver unit for transmitting the first multi-tone signal.

[0058] In conjunction with the second aspect, in some implementations of the second aspect, at least two single-tone signals with the same initial phase are symmetrical about the center frequency.

[0059] In conjunction with the second aspect, in some implementations of the second aspect, when N=4, the initial phases of the first and fourth monotone signals are the same, and / or the initial phases of the second and third monotone signals are the same, the frequency of the first monotone signal is the smallest, the frequency of the fourth monotone signal is the largest, and the second monotone signal is greater than the first monotone signal and less than the third monotone signal.

[0060] In conjunction with the second aspect, in some implementations of the second aspect, when N=8, one or more of the following conditions are met: the initial phases of the first and eighth single-tone signals are the same; the initial phases of the second and seventh single-tone signals are the same; the initial phases of the third and sixth single-tone signals are the same; or, the initial phases of the fourth and fifth single-tone signals are the same; the frequency of the first single-tone signal is the smallest; the frequency of the eighth single-tone signal is the largest; the frequency of the third single-tone signal is greater than the frequency of the second single-tone signal and less than the frequency of the fourth single-tone signal; the frequency of the fifth single-tone signal is greater than the frequency of the fourth single-tone signal and less than the frequency of the sixth single-tone signal; and the frequency of the sixth single-tone signal is less than the frequency of the seventh single-tone signal.

[0061] In conjunction with the second aspect, in some implementations of the second aspect, when N=4, for the PAPR of the signal to be less than or equal to 2 dB, the initial phases of the corresponding N monotone signals satisfy any of the following:

[0062] φ2=φ3=0, 1.59 ≤ φ1<1.86, φ4 ≥ - φ1 + 3.57, and φ4 ≤ - φ1 4 / 9 +2.69;

[0063] φ2=φ3=0, 1.86 ≤ φ1 ≤ 1.98, φ4 ≥ - φ1 + 3.57, and φ4 ≤ - φ1 9 / 4+ 6.04;

[0064] φ2=φ3=0, 4.3 ≤ φ1<4.42, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 9 / 4 +14.36; or,

[0065] φ2=φ3=0, 4.42 ≤ φ1<4.69, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 4 / 9 +6.38;

[0066] Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

[0067] In conjunction with the second aspect, in some implementations of the second aspect, when N=4, for the PAPR of the signal to be less than or equal to 2.5 dB, the initial phases of the corresponding N monotone signals satisfy any of the following:

[0068] φ2=φ3=0, 0 ≤ φ1<2.05, φ4 ≥ - φ1 + π, and φ4 ≤ - φ1 0.53 + π;

[0069] φ2=φ3=0, 2.05 ≤ φ1 ≤ π, φ4 ≥ - φ1 + π, and φ4 ≤ - φ1 1.88 +5.9;

[0070] φ2=φ3=0, π ≤ φ1<4.23, φ4 ≤ - φ1 + 9.42, and φ4 ≥ - φ1 1.88 + 12.18; or,

[0071] φ2=φ3=0, 4.23 ≤ φ1 ≤ 2π, φ4 ≤ - φ1 + 9.42, and φ4 ≥ - φ1 0.53 +6.47;

[0072] Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

[0073] In conjunction with the second aspect, in some implementations of the second aspect, when N=4, for the PAPR of the signal to be less than or equal to 3 dB, the initial phases of the corresponding N monotone signals satisfy any of the following:

[0074] φ2=φ3=0, 0 ≤ φ1<2.3, φ4 ≥ - φ1 + 2.92, and φ4 ≤ - φ1 0.46 +3.36;

[0075] φ2=φ3=0, 2.3 ≤ φ1<2.92, φ4 ≥ - φ1 + 2.92, and φ4 ≤ - φ1 2.17 +7.29;

[0076] φ2=φ3=0, 2.92 ≤ φ1<3.36, φ4 ≥ 0, and φ4 ≤ - φ1 2.17 + 7.29;

[0077] φ2=φ3=0, 2.92 ≤ φ1<3.36, φ4 ≤ 2π, and φ4 ≥ - φ1 2.17 + 12.62;

[0078] φ2=φ3=0, 3.36 ≤ φ1<3.98, φ4 ≤ - φ1 + 9.64, and φ4 ≥ - φ1 2.17 + 12.62; or,

[0079] φ2=φ3=0, 3.98 ≤ φ1<2π, φ4 ≤ - φ1 + 9.64, and φ4 ≥ - φ1 0.46 +5.81;

[0080] Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

[0081] In conjunction with the second aspect, in some implementations of the second aspect, the frequency interval between any two adjacent monotone signals among the N monotone signals is the same.

[0082] In conjunction with the second aspect, in some implementations of the second aspect, when N=4, the frequency interval between any two adjacent monotone signals among the N monotone signals is 1MHz.

[0083] In conjunction with the second aspect, in some implementations of the second aspect, when N=4, the frequency interval between any two adjacent monotone signals among the N monotone signals is 2MHz.

[0084] Thirdly, a multi-tone signal transmitting device is provided, including a processor and a memory. Optionally, a transceiver may also be included. The memory stores a computer program, the processor calls and runs the computer program stored in the memory, and controls the transceiver to transmit and receive signals, so that the angle measuring device performs the means as described in the first aspect or any possible implementation thereof.

[0085] Fourthly, a multi-tone signal transmitting apparatus is provided, comprising a processor and a communication interface, the communication interface being used to receive data and / or information and transmit the received data and / or information to the processor, the processor processing the data and / or information, and the communication interface being further used to output the processed data and / or information so that the apparatus as in the first aspect or any possible implementation of the first aspect is executed.

[0086] Fifthly, a computer-readable storage medium is provided, wherein computer instructions are stored therein, which, when executed on a computer, cause the means as described in the first aspect or any possible implementation thereof to be executed.

[0087] In a sixth aspect, a computer program product is provided, the computer program product comprising computer program code that, when run on a computer, causes the means as described in the first aspect or any possible implementation thereof to be executed. Attached Figure Description

[0088] Figure 1 This is a structural diagram of an angle-of-arrival positioning system applicable to this application.

[0089] Figure 2 This is a structural diagram of a departure angle positioning system applicable to this application.

[0090] Figure 3 This is a schematic diagram of upconverting a baseband multi-tone signal to a radio frequency multi-tone signal according to an embodiment of this application.

[0091] Figure 4 This is a schematic diagram of a baseband single-tone signal representation provided in an embodiment of this application.

[0092] Figure 5 This is a schematic diagram of another representation of a baseband single-tone signal provided in an embodiment of this application.

[0093] Figure 6 This is a schematic flowchart of a multi-tone signal determination device provided in an embodiment of this application.

[0094] Figures 7 to 9 This is a schematic diagram of a design scheme for a multi-tone signal (N=3) provided in an embodiment of this application.

[0095] Figures 10 to 13 This is a schematic diagram of a design scheme for a multi-tone signal (N=4) provided in an embodiment of this application.

[0096] Figures 14 to 16 This is a schematic diagram of a design scheme for a multi-tone signal (N=5) provided in an embodiment of this application.

[0097] Figures 17 to 19 This is a schematic diagram of a design scheme for a multi-tone signal (N=6) provided in an embodiment of this application.

[0098] Figures 20 to 22 This is a schematic diagram of a design scheme for a multi-tone signal (N=7) provided in an embodiment of this application.

[0099] Figures 23 to 25 This is a schematic diagram of a design scheme for a multi-tone signal (N=8) provided in an embodiment of this application.

[0100] Figure 26 This is a schematic diagram of a multi-tone signal rotating counterclockwise by Δφ according to an embodiment of this application.

[0101] Figure 27 This is a schematic diagram of a multi-tone signal shifted by Δt on the time axis according to an embodiment of this application.

[0102] Figure 28 This is a schematic diagram of the structure of a multi-tone signal transmitting device provided in an embodiment of this application.

[0103] Figure 29 This application provides a schematic diagram of the structure of another multi-tone signal transmitting device. Detailed Implementation

[0104] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0105] The technical solution of this application can be applied to wireless personal area networks (WPANs). Currently, WPANs adopt the IEEE 802.15 standard. WPANs can be used for communication between digital auxiliary devices such as telephones, computers, and peripherals within a small range. Technologies supporting wireless personal area networks include Bluetooth, ZigBee, Ultra Wideband (UWB), Infrared Data Association (IrDA) connectivity, and Home Radio Frequency (HomeRF). From a network architecture perspective, WPANs are located at the bottom layer of the overall network architecture, used for wireless connections between devices within a small range, i.e., point-to-point short-range connections, and can be considered short-range wireless communication networks. Depending on the application scenario, WPANs are further divided into high-rate (HR) WPANs and low-rate (LR) WPANs. HR-WPANs can be used to support various high-rate multimedia applications, including high-quality audio and video delivery, multi-megabyte music and image document transmission, etc. LR-WPAN can be used for general business in daily life.

[0106] In WPAN, devices are categorized into full-function devices (FFDs) and reduced-function devices (RFDs) based on their communication capabilities. FFDs can communicate with each other and with each other. RFDs cannot communicate directly; they can only communicate with FFDs or forward data through an FFD. The FFD associated with an RFD is called its coordinator. RFDs are primarily used for simple control applications, such as light switches and passive infrared sensors. They transmit relatively little data, consume minimal transmission and communication resources, and have low cost. The coordinator can also be called a personal area network (PAN) coordinator or central control node. The PAN coordinator is the master control node of the entire network, and there is typically only one PAN coordinator in each ad hoc network. It has functions such as membership management, link information management, and packet forwarding.

[0107] Optionally, the device (e.g., a transmitting device or a receiving device) in the embodiments of this application can be a device that supports the 802.15 series, such as a device that supports 802.15.4a and 802.15.4z, as well as a device that supports various WPAN standards, such as those currently under discussion or subsequent versions.

[0108] In the embodiments of this application, the aforementioned devices may be communication servers, routers, switches, bridges, computers or mobile phones, smart home devices, vehicle communication devices, etc.

[0109] In the embodiments of this application, the aforementioned device can be a wireless communication chip, a wireless sensor, or a wireless communication terminal. For example, it can be a user terminal, user equipment, access device, subscriber station, subscriber unit, mobile station, user agent, or user equipment that supports Wi-Fi communication. The user terminal can include various handheld devices, vehicle-mounted devices, wearable devices, Internet of Things (IoT) devices, computing devices, or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile station (MS), terminal, terminal equipment, portable communication devices, handheld devices, portable computing devices, entertainment devices, gaming devices or systems, GPS devices, or any other suitable device configured for network communication via wireless media. Furthermore, the device can support the 802.15.4ab standard or its next-generation standard. The device also supports multiple standards such as 802.15.4a, 802.15.4-2011, 802.15.4-2015, and 802.15.4z. Furthermore, it supports various wireless local area networks (WLANs) from the 802.11 family, including 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11a, and 802.11be next-generation.

[0110] In this embodiment, the device includes a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as Linux, Unix, Android, iOS, or Windows. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Furthermore, this embodiment does not specifically limit the specific structure of the execution entity of the device provided in this embodiment, as long as it can communicate according to the device provided in this embodiment by running a program that records the code of the device provided in this embodiment. For example, the execution entity of the device provided in this embodiment can be an FFD or an RFD, or a functional module in an FFD or RFD that can call and execute a program.

[0111] Furthermore, various aspects or features of this application can be implemented as devices, apparatuses, or articles of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used herein encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROMs), cards, sticks, or key drives, etc.). Additionally, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0112] The technical solutions of this application can also be applied to wireless local area network systems such as Internet of Things (IoT) networks or Vehicle-to-X (V2X) networks. Of course, the embodiments of this application can also be applied to other possible communication systems, such as Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, 5th Generation (5G) systems, and future 6th Generation (6G) systems.

[0113] It should be understood that AoA or AoD has already been applied in low-power narrowband wireless technology, and the technical solution provided in this application is applicable to Bluetooth indoor positioning systems. This Bluetooth indoor positioning system can be applied to indoor navigation devices, such as using a Bluetooth wristband as a navigation terminal, to effectively solve the problem that blind people cannot quickly, safely, and conveniently reach their target location from their current location when moving indoors, especially in public places such as hospitals, subway stations, and shopping malls. The basic principles of AoA or AoD are explained below using Bluetooth BLEAoA or AoD as an example.

[0114] Figure 1 This is a structural diagram of an AoA positioning system applicable to this application. (See diagram for example.) Figure 1 As shown, it includes a transmitting device and a receiving device. The transmitting device has one antenna, and the receiving device has two or more antennas (e.g., four antennas).

[0115] For example, when measuring the AoA angle using Bluetooth BLE, the transmitting device sends a single-tone signal, a special Bluetooth signal with a sine wave baseband, which the Bluetooth protocol calls (Constant Tone Extension, CTE). During the reception of the CTE signal, the receiving device continuously switches between antennas, simultaneously sampling the baseband signal of each antenna (containing phase information), i.e., measuring the phase of the signal corresponding to each antenna. The processor in the receiving device calculates the AoA angle by comparing the phase differences between the antennas.

[0116] Figure 2This is a structural diagram of an AoD positioning system applicable to this application. (See diagram for example.) Figure 2 As shown, it includes a transmitting device and a receiving device. The receiving device has one antenna, and the transmitting device has two or more antennas (e.g., four antennas).

[0117] For example, during Bluetooth BLE AoD angle measurement, the transmitting device sends a CTE signal while continuously switching between various antennas. While receiving the CTE single-tone signal, the receiving device identifies the transmitting antenna corresponding to each part of the CTE signal and samples the baseband signal corresponding to each antenna. The processor in the receiving device then calculates the angle based on the sampled baseband signal from each antenna.

[0118] It should be understood that the above Figure 1 and Figure 2 The AoA or AoD positioning systems shown are merely illustrative examples, and this application does not impose any specific limitations on them. The system is not limited to including other devices, such as other receiving devices.

[0119] Currently, low-power narrowband wireless technologies (such as Bluetooth and Zigbee) are increasingly widely used in daily life. Compared with other wireless technologies such as 5G and WiFi, the advantages of low-power narrowband wireless technologies are: (1) very low power consumption, which means longer device usage time; (2) relatively simpler design and lower device cost. This makes low-power narrowband wireless technologies widely used not only in consumer devices (such as mobile phones, wearables and smart homes), but also in the Industrial Internet of Things (IIoT). Low-power narrowband wireless technologies not only have device connection functions, but also the function of measuring the direction between devices (i.e., measuring AoA or AoD), which can be used to realize indoor positioning of devices. For example, Bluetooth AoA or AoD features are representative AoA or AoD protocols in low-power narrowband wireless technologies, making Bluetooth AoA or AoD indoor positioning systems increasingly popular. Some manufacturers' Zigbee devices can support MCPD ranging technology to obtain the distance between two devices. The direction and / or distance information can be used to calculate the location of the device.

[0120] It should be understood that AoA or AoD ranging, as well as Zigbee MCPD ranging, all involve sending a single tone (or a single carrier) signal to allow the receiving device to perform phase measurements at a specific frequency. To improve direction finding and ranging accuracy, phase measurements need to be performed at multiple frequency points. For example, Zigbee ranging uses 80 phase measurements at 1MHz intervals in the 2.4GHz Industrial, Scientific and Medical (ISM) band, covering the entire 80MHz band. Similarly, Bluetooth AoA or AoD ranging uses 37 phase measurements at 2MHz intervals, covering approximately 80MHz of the Bluetooth 2.4GHz ISM band, with a 2MHz interval between adjacent channels (or frequency points). It should be noted that the frequency band that can be used for BLE AoA or AoD is 2.404~2.478GHz. Furthermore, other details regarding Bluetooth BLE AoA or AoD can be found in the existing Bluetooth 5.1 protocol; for simplicity, they will not be elaborated upon here.

[0121] Considering that Bluetooth AoA / AoD and Zigbee MCPD both use single-tone (or one carrier) signals for phase measurement, only one frequency point within the entire ISM band can be measured at a time, resulting in a long measurement time for the entire band. To reduce the phase measurement time for AoA or AoD in low-power narrowband devices, as well as MCPD ranging, multi-tone signals can be transmitted. That is, the radio frequency signal emitted by the device antenna can cover multiple frequency points (or be regarded as multiple carrier signals or multiple single-tone signals).

[0122] Figure 3 This is a schematic diagram illustrating the upconversion of a baseband multi-tone signal to a radio frequency multi-tone signal according to an embodiment of this application. Figure 3As shown, the baseband multi-tone signal on the left can be up-converted to obtain the radio frequency multi-tone signal on the right. For example, assuming the baseband multi-tone signal (N=4, i.e., the number of tones is 4) has frequencies of f1=-1.5 MHz, f2=-0.5 MHz, f3=0.5 MHz, and f4=1.5 MHz, the baseband multi-tone signal and the carrier signal (assuming frequency fc = 2.4515 GHz) are input to a mixer for mixing. This up-converts the baseband multi-tone signal to an ISM band multi-tone signal with frequencies of f1+fc=2.450 GHz, f2+fc=2.451 GHz, f3+fc=2.452 GHz, and f4+fc=2.453 GHz. This allows for simultaneous measurement of the phase values ​​at these four frequency points: 2.450 GHz, 2.451 GHz, 2.452 GHz, and 2.453 GHz. Compared to traditional Bluetooth AoA / AoD and Zigbee MCPD ranging solutions, using multi-tone signals for phase measurement in AoA / AoD or MCPD ranging can significantly reduce the overall measurement time and power consumption.

[0123] It should be noted that, in order to perform uniform sampling across the entire ISM band, the amplitude of each tone in the aforementioned baseband multi-tone signal is set to the same value, and the frequency interval between two adjacent tones is the same.

[0124] It should be understood that the information of a baseband signal includes amplitude and phase, which will be discussed below. Figure 4 and Figure 5 Two representations are given to illustrate baseband single-tone signals. For example, the amplitude (A) and phase (φ) information of the baseband signal can be described in the form of (In-phase & Quadrature, IQ), i.e. , Alternatively, the IQ signal can also be represented in complex form, i.e. .

[0125] Specifically, such as Figure 4 As shown, when the baseband signal is a single-tone signal (i.e., a sine wave), the signal amplitude is fixed, and the phase φ satisfies the following relationship with time t: f is the frequency of the signal. This is the initial phase of the signal (i.e., the phase of the signal at t=0). Therefore, the IQ of a baseband single-tone signal can be expressed as: , When the signal frequency f is positive, the phase φ increases with time t, meaning the signal rotates counterclockwise in the IQ plane with time t; conversely, when the signal frequency f is negative, the signal rotates clockwise in the IQ plane with time t.

[0126] Specifically, such as Figure 5As shown, when two baseband single-tone signals s1 and s2 are added, their sum s1 + s2 (i.e., addition of complex numbers) can be obtained using the parallelogram rule. It should be understood that the amplitude of the baseband single-tone signal is fixed, as shown above. , The amplitude of the signal remains constant at A and does not change over time. For polyphonic signals, the IQ is the sum of the IQs of each note (i.e., the complex addition of the individual IQs), and its amplitude changes over time.

[0127] For example, in a multi-tone signal with N=4 (i.e., 4 notes), the frequencies of the individual notes are f1=-1.5 MHz, f2=-0.5 MHz, f3=0.5 MHz, and f4=1.5 MHz. Each note has an amplitude of 1 and an initial phase of 0. Therefore, the maximum amplitude of this multi-tone signal is 4, corresponding to a maximum power of 4. 4 = 16. Since the power of each note is 1 (the amplitude of each note is always 1), the average power of the multi-tone signal is 4. Therefore, the peak-to-average power ratio (PAPR) of this multi-tone signal is equal to 4. Assuming the maximum power of the PA in the transmitting device is 10dBm, then the average power of the above multi-tone signal transmission can only be set to a maximum of 10 – 6.02 = 3.98dBm. Otherwise, the peak power will exceed the upper limit of the PA, causing the signal emitted by the PA to be distorted.

[0128] In summary, the higher the PAPR of a multi-tone signal, the lower the average power of the transmitted signal. Therefore, it is urgent to design a multi-tone signal that ensures the PAPR is as low as possible, thereby achieving the optimal average transmission power.

[0129] In view of this, this application provides a method and apparatus for transmitting multi-tone signals. By changing the initial phase, different multi-tone signals are designed to minimize the PAPR of the signal, thereby increasing the average power of the multi-tone signal transmission and improving the transmission distance or coverage of the multi-tone signal. Specifically, for multi-tone signals with different numbers of tones, corresponding waveform designs (i.e., the initial phase of each tone) are identified to minimize the PAPR of the multi-tone signal.

[0130] To facilitate understanding of the embodiments of this application, the terms or technologies involved in this application will be briefly explained.

[0131] 1. AoA

[0132] By using a single antenna to transmit direction-finding data packets, a low-energy (LE) device can make its direction-finding capability available to a peer device. This peer device includes an RF switch and an antenna array that switches antennas and acquires IQ samples while receiving partial data packets. The IQ samples can be used to calculate the phase difference of the radio signals received by different elements of the antenna array, and thus to estimate the angle of arrival (AoA).

[0133] 2. AoD

[0134] By using multiple antennas to transmit direction-finding data packets and switching antennas while transmitting packets, the LE device can make its direction available to a peer device. The peer device includes an RF switch and a single antenna, receives data packets transmitted by each antenna and acquires IQ samples, calculates the phase difference between the antennas based on the IQ of each antenna, and can then use this to estimate the departure angle AoD.

[0135] 3. Narrowband signal

[0136] In this application, "narrowband signal" is used in contrast to "ultra-wideband signal." Ultra-wideband signals typically have a bandwidth of at least 500MHz. Signals with bandwidth less than that of ultra-wideband signals are considered narrowband signals. Optionally, narrowband signals include, but are not limited to, signals provided by the following wireless technologies: Bluetooth, Wi-Fi, technologies based on the 802.15.4 standard (such as Thread technology), and WiFi technology (including various 802.11 standards). Furthermore, it may also include cellular systems' narrowband Internet of Things (NB-IoT), Long Term Evolution-Machine to Machine (LTE-M), LoRa, and Sigfox, as well as other future wireless technologies that can provide narrowband signals, without limitation.

[0137] 4. Up-conversion and down-conversion

[0138] Up-conversion refers to shifting the frequency spectrum of a baseband signal to a higher carrier frequency. In other words, up-conversion modulates the baseband signal onto a single carrier, or transforms a signal modulated on a low-frequency carrier to a high-frequency carrier. Specifically, the frequency-converted signal is mixed with a sinusoidal signal (local oscillator) generated by a local oscillator (LO) to change the signal's frequency band. The upper sideband signal after mixing is up-converted, i.e., increasing the frequency; the lower sideband signal after mixing is down-converted, i.e., decreasing the frequency.

[0139] 5. Single-tone signals and multi-tone signals

[0140] A single-tone signal is a sine wave of a single frequency, meaning it has only one spectral line. A multi-tone signal is generated by superimposing multiple independent sine wave waveforms, meaning it has multiple spectral lines.

[0141] To facilitate understanding of the embodiments of this application, the following points are made:

[0142] First, in this application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0143] Second, in this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can mean: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a, b, and c. Here, a, b, and c can be single or multiple.

[0144] Third, in this application, the terms "first," "second," and various numerical designations (e.g., #1, #2, etc.) indicate distinctions made for ease of description and are not intended to limit the scope of the embodiments of this application. For example, they distinguish different messages, rather than describing a specific order or sequence. It should be understood that such descriptions can be interchanged where appropriate to describe solutions other than those in the embodiments of this application.

[0145] Fourth, in this application, descriptions such as "when," "under the circumstances," and "if" all refer to the device making corresponding processing under certain objective circumstances, and are not time-limited, nor do they require the device to make a judgment action when implementing it, nor do they imply any other limitations.

[0146] Fifth, in this application, the terms “comprising” and “having” and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, apparatus, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, apparatus, product or device.

[0147] Sixth, in this application, "protocol" may refer to standard protocols in the field of communications, such as 5G protocols, Bluetooth protocols, and related protocols applied in future communication systems, and this application does not limit this term.

[0148] Seventh, in this application, a frequency point refers to a specific absolute frequency value, generally the center frequency of the modulated signal. It should be understood that a frequency point is a number assigned to a fixed frequency. A frequency band refers to the range from one frequency point to another.

[0149] Eighth, in the embodiments of this application, the character " " is an operator that represents multiplication.

[0150] The technical solution provided in this application will be described in detail below with reference to the accompanying drawings.

[0151] Figure 6 This is a flowchart illustrating the first method for transmitting multi-tone signals provided in this application. For example... Figure 6 As shown, the device includes the following steps.

[0152] S610 generates the first multi-tone signal.

[0153] The first multi-tone signal includes N single-tone signals, each with the same amplitude value. At least two of the N single-tone signals have the same initial phase, or at least two of the N single-tone signals have the same absolute value of their initial phases. N is an integer greater than or equal to 2.

[0154] It should be noted that, in order to ensure that the frequency points are uniformly distributed during AoA or AoD and MCPD ranging measurements, the baseband multi-tone signal considered in this application has the same amplitude for each tone, and the frequency interval between two adjacent tones is the same. For ease of analysis, the amplitude of each tone in the multi-tone signal shown in this application is normalized to 1.

[0155] For example, taking N=4 as an example, the initial phase of the first polyphonic signal can be 1.81, 0, 0 and 1.81; or, the initial phase of the first polyphonic signal can also be 4.47, 0, 0 and 4.47, or, the initial phase of the first polyphonic signal can also be -0.08, -0.63, 0.63 and 3.70, etc., and this application does not make specific limitations in this regard.

[0156] Optionally, at least two single-tone signals with the same initial phase are symmetrical about the center frequency.

[0157] For example, taking N=4, the initial phase of the first single-tone signal is φ1 = 1.81, the initial phase of the second single-tone signal is φ2 = 0, the initial phase of the third single-tone signal is φ3 = 0, and the initial phase of the fourth single-tone signal is φ4 = 1.81. Correspondingly, the frequency of the first single-tone signal is -1.5MHz, the frequency of the second single-tone signal is -0.5MHz, the frequency of the third single-tone signal is 0.5MHz, and the frequency of the fourth single-tone signal is 1.5MHz. That is, the first and fourth single-tone signals are symmetrical about the center frequency, and the second and fourth single-tone signals are also symmetrical about the center frequency.

[0158] Next, taking a polyphonic signal with 3 single notes (N=3) as an example, combined with... Figures 7 to 9 The design scheme for multi-tone signals is explained.

[0159] like Figure 7 As shown, the first single-tone signal in this multi-tone signal has the smallest frequency, for example, f1 = -1 MHz; the third single-tone signal has the largest frequency, for example, f3 = 1 MHz; and the second single-tone signal has a frequency between the first and third single-tone signals, for example, f2 = 0 MHz. The frequency interval of this multi-tone signal is 1 MHz, and the amplitude of each tone is the same.

[0160] It should be noted that the initial phase value of each single-tone signal is between 0 and 2π. By iterating through the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combinations are recorded. For example, assuming φ1, φ2, and φ3 are the initial phases of a multi-tone signal with frequencies f1, f2, and f3 respectively, when φ1 = 0 and φ3 = 0, by iterating through the initial phases of φ2, it can be found that φ2 = 1.57 or φ2 = 4.71 corresponds to the minimum PAPR, i.e., 2.22 dB. This is significantly lower than the PAPR of 10 for traditional multi-tone signals. lg(3 3 / 3) = 4.77dB (the initial phase of each tone is 0), this implementation can achieve a gain of 4.77dB – 2.22dB = 2.55dB. That is, "φ1 = 0, φ2 = 1.57, φ3 = 0" and "φ1 = 0, φ2 = 4.71, φ3 = 0" are used as the optimal initial phase combinations for a multi-tone signal of N=3 (f1=-1 MHz, f2=0 MHz, f3=1 MHz).

[0161] Figure 8 The trajectory of the multi-tone signal in the IQ plane corresponding to the optimal initial phase combination "φ1 = 0, φ2 = 1.57, φ3 = 0" (assuming the amplitude of each tone is 1). Figure 8As shown, as time increases, the IQ of the multi-tone signal moves back and forth on a "straight line" trajectory.

[0162] Figure 9 This is a graph showing the amplitude variation over time of the polyphonic signal corresponding to the optimal initial phase combination "φ1 = 0, φ2 = 1.57, φ3 = 0". Figure 9 As shown, the maximum amplitude of the multi-tone signal is 2.24, and the corresponding PAPR is 2.22dB.

[0163] It should be noted that, based on the two sets of optimal initial phase values ​​"φ1 = 0, φ2 = 1.57, φ3 = 0" and "φ1 = 0, φ2 = 4.71, φ3 = 0" as two sets of "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. These will be explained in detail below and will not be elaborated upon here.

[0164] Next, let's take a polyphonic signal with 4 single notes as an example, combined with... Figures 10 to 13 The design scheme for multi-tone signals is explained.

[0165] like Figure 10 As shown, the frequency of the first single-tone signal in this multi-tone signal is -1.5MHz, the frequency of the second single-tone signal is -0.5MHz, the frequency of the third single-tone signal is 0.5MHz, and the frequency of the fourth single-tone signal is 1.5MHz. The frequency interval of this multi-tone signal is 1 MHz, and the amplitude of each tone is the same.

[0166] By iterating through the initial phases of each tone, the minimum PAPR value of the multi-tone signal can be determined to be 1.84 dB, and the corresponding initial phase combinations are recorded. For example, assume φ1, φ2, φ3, and φ4 are the initial phases of a multi-tone signal with frequencies f1, f2, f3, and f4, respectively. When φ2 = 0 and φ3 = 0, the PAPR contour lines corresponding to the two initial phases φ1 and φ4 are obtained. See [link to documentation] for details. Figure 11 We can observe that the PAPR corresponding to "φ1 = φ4 = 1.81" or "φ1 = φ4 = 4.47" is the lowest, i.e., 1.84 dB. This is significantly lower than the PAPR of 10 for traditional multi-tone signals. log(4 (4 / 4) = 6.02dB (the initial phase of each note is 0), this implementation can achieve a gain of 6.02dB – 1.84dB = 4.18dB.

[0167] That is, “φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81” and “φ1 = 4.47, φ2 = 0, φ3 = 0, φ4 = 4.47” are taken as the optimal initial phase combination of the multi-tone signal with N=4 (f1=-1.5 MHz, f2=-0.5 MHz, f3=0.5 MHz, f4=1.5 MHz).

[0168] Figure 12 The trajectory of the multi-tone signal in the IQ plane corresponding to the optimal initial phase combination "φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81" (assuming the amplitude of each tone is 1). Figure 12 As shown, as time increases, the IQ of the polyphonic signal moves back and forth on this trajectory similar to the letter "N", with the time to complete one cycle being 2µs.

[0169] Figure 13 The graph shows the amplitude variation over time of the multi-tone signal phase corresponding to the optimal initial phase combination "φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81". Figure 13 The maximum amplitude of the polyphonic signal is 2.47, corresponding to a PAPR of 1.84 dB.

[0170] It should be noted that, based on the two sets of optimal initial phase values ​​"φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81" and "φ1 = 4.47, φ2 = 0, φ3 = 0, φ4 = 4.47" as two "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. These will be explained in detail below and will not be elaborated upon here.

[0171] like Figure 11 As shown, when φ2 = 0 and φ3 = 0, the corresponding PAPR contour lines are obtained by traversing the two initial phases φ1 and φ4.

[0172] In one possible implementation, when PAPR is less than or equal to 2dB, the corresponding values ​​of φ1 and φ4 include the following cases:

[0173] (1) The approximate triangle (lower left) corresponding to the contour line PAPR=2dB has the following initial phase values ​​for the three vertices: (φ1=1.59, φ4=1.98), (φ1=1.98, φ4=1.59) and (φ1=1.86, φ4=1.86).

[0174] Specifically, when 1.59 ≤ φ1 < 1.86, φ4 ≥ -φ1 + 3.57 and φ4 ≤ -φ1 4 / 9 +2.69; or,

[0175] When 1.86 ≤ φ1 ≤ 1.98, φ4 ≥ -φ1 + 3.57 and φ4 ≤ -φ1 9 / 4 + 6.04.

[0176] (2) The approximate triangle (upper right) corresponding to the contour line PAPR=2dB has the following initial phase values ​​at the three vertices: (φ1=4.3, φ4=4.69), (φ1=4.69, φ4=4.3) and (φ1=4.42, φ4=4.42).

[0177] Specifically, when 4.3 ≤ φ1 < 4.42, φ4 ≤ -φ1 + 8.99 and φ4 ≥ -φ1 9 / 4 +14.36; or,

[0178] When 4.42 ≤ φ1 < 4.69, φ4 ≤ -φ1 + 8.99 and φ4 ≥ -φ1 4 / 9 + 6.38.

[0179] In another possible implementation, when PAPR is less than or equal to 2.5dB, the corresponding values ​​of φ1 and φ4 include the following cases:

[0180] (1) The approximate triangle (lower left) corresponding to the contour line PAPR=2.5dB has the following initial phase values ​​for the three vertices: (φ1=0, φ4=π), (φ1=π, φ4=0) and (φ1=2.05, φ4=2.05).

[0181] Specifically, when 0 ≤ φ1 < 2.05, φ4 ≥ -φ1 + π and φ4 ≤ -φ1 0.53 + π; or,

[0182] When 2.05 ≤ φ1 ≤ π, φ4 ≥ - φ1 + π and φ4 ≤ - φ1 1.88 + 5.9.

[0183] (2) The approximate triangle (upper right) corresponding to the contour line PAPR=2.5dB has the following initial phase values ​​for the three vertices: (φ1= π, φ4=2π), (φ1=2π, φ4= π) and (φ1=4.23, φ4=4.23).

[0184] Specifically, when π ≤ φ1 < 4.23, φ4 ≤ -φ1 + 9.42 and φ4 ≥ -φ1 1.88 + 12.18; or,

[0185] When 4.23 ≤ φ1 ≤ 2π, φ4 ≤ -φ1 + 9.42 and φ4 ≥ -φ1 0.53 + 6.47.

[0186] In another possible implementation, when PAPR is less than or equal to 3 dB, the corresponding values ​​of φ1 and φ4 include the following:

[0187] (1) The approximate pentagon (lower left) corresponding to the contour line PAPR=3dB has the following initial phase values ​​for the five vertices: (φ1=0, φ4=2.92), (φ1=0, φ4=3.36), (φ1=2.3, φ4=2.3), (φ1=3.36, φ4=0) and (φ1=2.92, φ4=0).

[0188] Specifically, when 0 ≤ φ1 < 2.3, φ4 ≥ -φ1 + 2.92 and φ4 ≤ -φ1 0.46 +3.36;

[0189] When 2.3 ≤ φ1 < 2.92, φ4 ≥ -φ1 + 2.92 and φ4 ≤ -φ1 2.17 + 7.29; or,

[0190] When 2.92 ≤ φ1 < 3.36, φ4 ≥ 0 and φ4 ≤ -φ1 2.17 + 7.29.

[0191] (2) The approximate pentagon (upper right) corresponding to the contour line PAPR=3dB has the following initial phase values ​​for the five vertices: (φ1=2π, φ4=3.36), (φ1=2π, φ4=2.92), (φ1=3.98, φ4=3.98), (φ1=2.92, φ4=2π) and (φ1=3.36, φ4=2π).

[0192] Specifically, when 2.92 ≤ φ1 < 3.36, φ4 ≤ 2π and φ4 ≥ -φ1 2.17 + 12.62;

[0193] When 3.36 ≤ φ1 < 3.98, φ4 ≤ -φ1 + 9.64 and φ4 ≥ -φ1 2.17 + 12.62; or,

[0194] When 3.98 ≤ φ1 < 2π, φ4 ≤ -φ1 + 9.64 and φ4 ≥ -φ1 0.46 + 5.81.

[0195] Based on the above implementation, if the initial phase of a certain multi-tone signal does not fall within the initial phase range corresponding to a PAPR less than or equal to 3dB, then the PAPR of the multi-tone signal is at least 3-1.84=1.16 dB higher than the PAPR of the multi-tone signal provided in this application, and correspondingly, the average power of the transmitted signal is at least 1.16 dB lower.

[0196] Next, let's take a polyphonic signal with 5 single notes as an example, combined with... Figures 14 to 16 The design scheme for multi-tone signals is explained.

[0197] like Figure 14 As shown, the first monotone signal in this multi-tone signal has the smallest frequency, for example, f1 = -1 MHz; the fifth monotone signal has the largest frequency, for example, f5 = 1 MHz; the second monotone signal's frequency is between the first and third monotone signals, for example, f2 = -0.5 MHz and f3 = 0 MHz; and the fourth monotone signal's frequency is between the third and fifth monotone signals, for example, f4 = 0.5 MHz. The frequency interval of this multi-tone signal is 0.5 MHz, and the amplitude of each tone is the same.

[0198] By iterating through the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combinations can be recorded. For example, assuming φ1, φ2, φ3, φ4, and φ5 are the initial phases of a multi-tone signal with frequencies f1, f2, f3, f4, and f5 respectively, when φ2 = 0 and φ4 = 0, by iterating through the initial phases of φ1, φ3, φ4, and φ5, we can find that "φ1 = 1.05, φ3 = 3.01, φ5 = 1.05" or "φ1 = 2.09, φ3 = 0.13, φ5 = 2.09" correspond to the lowest PAPR, i.e., 1.76 dB. This is significantly lower than the PAPR of 10 for traditional multi-tone signals. log(5 (5 / 5) = 6.99dB (the initial phase of each tone is 0), this implementation can achieve a gain of 6.99dB – 1.76dB = 5.23dB. That is, "φ1 = 1.05, φ2 = 0, φ3 = 3.01, φ4 = 0, φ5 = 1.05" and "φ1 = 2.09, φ2 = 0, φ3 = 0.13, φ4 = 0, φ5 = 2.09" are used as the optimal initial phase combinations for a multi-tone signal of N=5 (f1=-1 MHz, f2=-0.5 MHz, f3=0 MHz, f4=0.5 MHz, f5=1 MHz).

[0199] Figure 15 The trajectory of the multi-tone signal in the IQ plane corresponding to the optimal initial phase combination "φ1 = 1.05, φ2 = 0, φ3 = 3.01, φ4 = 0, φ5 = 1.05" (assuming the amplitude of each tone is 1). Figure 15 As shown, as time increases, the IQ of the multi-tone signal moves back and forth on the trajectory shown in the figure.

[0200] Figure 16 The graph shows the amplitude variation over time of the polyphonic signal corresponding to the optimal initial phase combination "φ1 = 1.05, φ2 = 0, φ3 = 3.01, φ4 = 0, φ5 = 1.05". Figure 16 As shown, the maximum amplitude of the polyphonic signal is 2.74, and the corresponding PAPR is 1.76dB.

[0201] It should be noted that, based on the two sets of optimal initial phase values ​​"φ1 = 1.05, φ2 = 0, φ3 = 3.01, φ4 = 0, φ5 = 1.05" and "φ1 = 2.09, φ2 = 0, φ3 = 0.13, φ4 = 0, φ5 = 2.09" as two sets of "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. These will be explained in detail below and will not be elaborated upon here.

[0202] Next, let's take a polyphonic signal with 6 single notes as an example, combined with... Figures 17 to 19 The design scheme for multi-tone signals is explained.

[0203] like Figure 17As shown, the first monotone signal in this multi-tone signal has the smallest frequency, for example, f1 = -1.25 MHz; the sixth monotone signal has the largest frequency, for example, f6 = 1.25 MHz; the second monotone signal's frequency is between the first and third monotone signals, for example, f2 = -0.75 MHz and f3 = -0.25 MHz; and the fourth monotone signal's frequency is between the third and fifth monotone signals, for example, f4 = 0.25 MHz and f5 = 0.75 MHz. The frequency interval of this multi-tone signal is 0.5 MHz, and the amplitude of each tone is the same.

[0204] By iterating through the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combinations can be recorded. For example, assuming φ1, φ2, φ3, φ4, φ5, and φ6 are the initial phases of a multi-tone signal with frequencies f1, f2, f3, f4, f5, and f6 respectively, when φ3 = 0 and φ4 = 0, by iterating through the initial phases of φ1, φ2, φ5, and φ6, we can find that "φ1 = 5.00, φ2 = 3.67, φ5 = 3.67, φ6 = 5.00" or "φ1 = 1.28, φ2 = 2.61, φ5 = 2.61, φ6 = 1.28" corresponds to the lowest PAPR value, i.e., 1.90 dB. This is significantly lower than the PAPR of 10 for traditional multi-tone signals. log(6 With an initial phase of 7.78 dB (6 / 6) (all initial phases of each tone are 0), this implementation can achieve a gain of 7.78 dB – 1.90 dB = 5.88 dB. That is, the optimal initial phase combinations for a multi-tone signal are "φ1 = 5.00, φ2 = 3.67, φ3 = 0, φ4 = 0, φ5 = 3.67, φ6 = 5.00" and "φ1 = 1.28, φ2 = 2.61, φ3 = 0, φ4 = 0, φ5 = 2.61, φ6 = 1.28" for N=6 (f1=-1.25 MHz, f2=-0.75 MHz, f3=-0.25 MHz, f4=0.25 MHz, f5=0.75 MHz, f6=1.25 MHz).

[0205] Figure 18 The trajectory of the polyphonic signal in the IQ plane corresponding to the optimal initial phase combination "φ1 = 5.00, φ2 = 3.67, φ3 = 0, φ4 = 0, φ5 = 3.67, φ6 = 5.00" (assuming the amplitude of each tone is 1). Figure 18 As shown, as time increases, the IQ of the multi-tone signal moves back and forth on the trajectory shown in the figure, and the time to complete one cycle is 4µs.

[0206] Figure 19 The graph shows the amplitude variation over time of the polyphonic signal corresponding to the optimal initial phase combination "φ1 = 5.00, φ2 = 3.67, φ3 = 0, φ4 = 0, φ5 = 3.67, φ6 = 5.00". Figure 19 As shown, the maximum amplitude of this polyphonic signal is 3.05, and the corresponding PAPR is 1.90 dB.

[0207] It should be noted that, based on the two sets of optimal initial phase values ​​"φ1 = 5.00, φ2 = 3.67, φ3 = 0, φ4 = 0, φ5 = 3.67, φ6 = 5.00" and "φ1 = 1.28, φ2 = 2.61, φ3 = 0, φ4 = 0, φ5 = 2.61, φ6 = 1.28" as two sets of "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. These will be explained in detail below and will not be elaborated upon here.

[0208] Next, let's take a polyphonic signal with 7 single notes as an example, combined with... Figures 20 to 22 The design scheme for multi-tone signals is explained.

[0209] like Figure 20 As shown, the first monotone signal in this multi-tone signal has the smallest frequency, for example, f1 = -1.5 MHz; the seventh monotone signal has the largest frequency, for example, f7 = 1.5 MHz; the second monotone signal's frequency is between the first and third monotone signals, for example, f2 = -1 MHz, f3 = -0.5 MHz; the fourth monotone signal's frequency is between the third and fifth monotone signals, for example, f4 = 0 MHz, f5 = 0.5 MHz; and the sixth monotone signal's frequency is between the fifth and seventh monotone signals, for example, f6 = 1 MHz. The frequency interval of this multi-tone signal is 0.5 MHz, and the amplitude of each tone is the same.

[0210] By iterating through the initial phases of each tone, the minimum PAPR of the multi-tone signal can be determined, and the corresponding initial phase combinations can be recorded. For example, assuming φ1, φ2, φ3, φ4, φ5, φ6, and φ7 are the initial phases of a multi-tone signal with frequencies f1, f2, f3, f4, f5, f6, and f7 respectively, when φ3 = 0 and φ5 = 0, by iterating through the initial phases of φ1, φ2, φ4, φ6, and φ7, we can find that "φ1 = 3.14, φ2 = 1.57, φ4 = 1.57, φ6 = 1.57, φ7 = 3.14" or "φ1 = 3.14, φ2 = 4.71, φ4 = 4.71, φ6 = 4.71, φ7 = 3.14" corresponds to the lowest PAPR value, i.e., 1.38 dB. This is significantly lower than the PAPR of 10 for traditional multi-tone signals. log(7 7 / 7) = 8.45dB (the initial phase of each note is 0), this implementation can achieve a gain of 8.45dB – 1.38dB = 7.07dB. That is, “φ1 = 3.14, φ2 = 1.57, φ3 = 0, φ4 = 1.57, φ5 = 0, φ6 = 1.57, φ7 = 3.14” and “φ1 = 3.14, φ2 = 4.71, φ3 = 0, φ4 = 4.71, φ5 = 0, φ6 = 4.71, φ7 = 3.14” are taken as the optimal initial phase combination of the multi-tone signal N=6 (f1=-1.25 MHz, f2=-0.75 MHz, f3=-0.25 MHz, f4=0.25 MHz, f5=0.75 MHz, f6=1.25MHz).

[0211] Alternatively, “φ1 = π, φ2 = π / 2, φ3 = 0, φ4 = π / 2, φ5 = 0, φ6 = π / 2, φ7 = π” and “φ1 = π, φ2 = 3π / 2, φ3 = 0, φ4 = 3π / 2, φ5 = 0, φ6 = 3π / 2, φ7 = π” can be used as the optimal initial phase combination for a multi-tone signal with N=7 (f1=-1.5 MHz, f2=-1 MHz, f3=-0.5 MHz, f4=0 MHz, f5=0.5 MHz, f6=1 MHz, f7=1.5 MHz).

[0212] Figure 21The trajectory of the polyphonic signal in the IQ plane corresponding to the optimal initial phase combination "φ1 = 3.14, φ2 = 1.57, φ3 = 0, φ4 = 1.57, φ5 = 0, φ6 = 1.57, φ7 = 3.14" is shown (assuming the amplitude of each tone is 1). Figure 21 As shown, as time increases, the IQ of the multi-tone signal moves back and forth on the trajectory shown in the figure.

[0213] Figure 22 The graph shows the amplitude variation over time of the polyphonic signal corresponding to the optimal initial phase combination "φ1 = 3.14, φ2 = 1.57, φ3 = 0, φ4 = 1.57, φ5 = 0, φ6 = 1.57, φ7 = 3.14". Figure 22 As shown, the maximum amplitude of this multi-tone signal is 3.1, and the corresponding PAPR is 1.38 dB.

[0214] It should be noted that, based on the two sets of optimal initial phase values ​​"φ1 = 3.14, φ2 = 1.57, φ3 = 0, φ4 = 1.57, φ5 = 0, φ6 = 1.57, φ7 = 3.14" and "φ1 = 3.14, φ2 = 4.71, φ3 = 0, φ4 = 4.71, φ5 = 0, φ6 = 4.71, φ7 = 3.14" as two sets of "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. These will be explained in detail below and will not be elaborated upon here.

[0215] Next, let's take an example where the number of single notes in a polyphonic signal is equal to 8. Figures 23 to 25 The design scheme for multi-tone signals is explained.

[0216] like Figure 23 As shown, the first single-tone signal in this multi-tone signal has the smallest frequency, for example, f1 = -1.75 MHz; the eighth single-tone signal has the largest frequency, for example, f8 = 1.75 MHz; the second single-tone signal's frequency is between the first and third single-tone signals, for example, f2 = -1.25 MHz and f3 = -0.75 MHz; the fourth single-tone signal's frequency is between the third and fifth single-tone signals, for example, f4 = -0.25 MHz and f5 = 0.25 MHz; and the sixth single-tone signal's frequency is between the fifth and seventh single-tone signals, for example, f6 = 0.75 MHz and f7 = 1.25 MHz. The frequency interval of this multi-tone signal is 0.5 MHz, and the amplitude of each tone is the same.

[0217] By iterating through the initial phases of each tone, the lowest PAPR of the multi-tone signal can be determined, and the corresponding initial phase combinations can be recorded. For example, assuming φ1, φ2, φ3, φ4, φ5, φ6, φ7, and φ8 are the initial phases of a multi-tone signal with frequencies f1, f2, f3, f4, f5, f6, f7, and f8, respectively, when φ4 = 0 and φ5 = 0, by iterating through the initial phases of φ1, φ2, φ3, φ6, φ7, and φ8, we can find that "φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40" or "φ1 = 0.88, φ2 = 2.45, φ3 = 5.37, φ6 = 5.37, φ7 = 2.45, φ8 = 0.88" corresponds to the lowest PAPR value, i.e., 1.16 dB. This is significantly lower than the PAPR of 10 for traditional multi-tone signals. log(8 (8 / 8) = 9.03 dB (the initial phase of each tone is 0), this implementation can achieve a gain of 9.03 dB – 1.16 dB = 7.87 dB. That is, the optimal initial phase combination of “φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ4 = 0, φ5 = 0, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40” and “φ1 = 0.88, φ2 = 2.45, φ3 = 5.37, φ4 = 0, φ5 = 0, φ6 = 5.37, φ7 = 2.45, φ8 = 0.88” is taken as N=8 (f1=-1.75 MHz, f2=-1.25 MHz, f3=-0.75 MHz, f4=-0.25 MHz, f5=0.25 MHz, f6=0.75 MHz, f7=1.25 MHz, f8=1.75 MHz) multi-tone signals.

[0218] Figure 24 The trajectory of the polyphonic signal in the IQ plane corresponding to the optimal initial phase combination "φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ4 = 0, φ5 = 0, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40" (assuming the amplitude of each tone is 1). Figure 24 As shown, as time increases, the IQ of the multi-tone signal moves back and forth on the trajectory shown in the figure, and the time to complete one cycle is 4µs.

[0219] Figure 25The graph shows the amplitude variation over time of the polyphonic signal corresponding to the optimal initial phase combination "φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ4 = 0, φ5 = 0, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40". Figure 25 As shown, the maximum amplitude of this multi-tone signal is 3.1, and the corresponding PAPR is 1.16 dB.

[0220] It should be noted that, based on the two sets of optimal initial phase values ​​"φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ4 = 0, φ5 = 0, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40" and "φ1 = 0.88, φ2 = 2.45, φ3 = 5.37, φ4 = 0, φ5 = 0, φ6 = 5.37, φ7 = 2.45, φ8 = 0.88" as two sets of "basic optimal initial phase combinations", various other optimal initial phase combinations can be derived. These will be explained in detail below and will not be elaborated upon here.

[0221] It should be noted that the number of tones in the multi-tone signal given above is only for the purpose of facilitating understanding of the scheme and should not constitute any limitation on the technical solution of this application.

[0222] S620, the transmitting device sends the first multi-tone signal to the receiving device.

[0223] Correspondingly, the receiving device receives the first multi-tone signal from the transmitting device.

[0224] The following is combined with Figure 26 and Figure 27 For the "basic optimal initial phase combination" corresponding to the number of different tones (e.g., N=3, 4, 5, 6, 7, 8) provided in the above implementation method, we will explain how to derive several possible implementation methods of other optimal initial phase combinations.

[0225] In one possible implementation, based on the fact that at least two monotone signals have the same phase, the initial phase of each monotone signal in the first polytone signal is increased by the same phase Δφ, where Δφ can be any value. That is, each point of each monotone signal on the IQ plane is rotated counterclockwise by Δφ, and the corresponding polytone signal is also rotated counterclockwise by Δφ on the IQ plane. This rotation does not change the amplitude of the polytone signal, so the rotated polytone signal can also obtain the optimal PAPR.

[0226] For example, with N=4, the initial phases of each monotone signal in the first polyphonic signal, φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81, are all rotated counterclockwise by Δφ = π / 6 = 0.52, resulting in initial phases of φ1 = 2.33, φ2 = 0.52, φ3 = 0.52, φ4 = 2.33. It should be understood that these two sets of initial phase combinations correspond to the same PAPR.

[0227] Specifically, Figure 26 This is a schematic diagram illustrating a multi-tone signal rotating counterclockwise by Δφ, as provided in an embodiment of this application. Figure 26 As shown, the IQ trajectory with the basic initial phases "φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81" in the IQ plane, after being rotated counterclockwise, increases the initial phase of each note by Δφ = π / 6 = 0.52, that is, the initial phases become "φ1 = 2.33, φ2 = 0.52, φ3 = 0.52, φ4 = 2.33", which corresponds to the same optimal PAPR.

[0228] In another possible implementation, based on the fact that at least two monotone signals are in phase, each monotone signal in the first multitone signal is... The polyphonic signal is also shifted by Δt on the time axis, where Δt is any value.

[0229] This is equivalent to increasing the initial phase of each monotone signal. This shift does not affect the maximum amplitude of the polyphonic signal, therefore the shifted polyphonic signal can also achieve the optimal PAPR.

[0230] For example, with N=4, shifting the initial phases φ1 = 1.81, φ2 = 0, φ3 = 0, and φ4 = 1.81 in the first polyphonic signal to the left by Δt = 0.2µs on the time axis results in initial phases of φ1 = -0.08, φ2 = -0.63, φ3 = 0.63, and φ4 = 3.70. It should be understood that these two sets of initial phase combinations correspond to the same PAPR.

[0231] Specifically, Figure 27 This is a schematic diagram illustrating the translation of a multi-tone signal by Δt on the time axis, as provided in an embodiment of this application. Figure 27As shown, the amplitude of the polyphonic signal corresponding to the basic initial phase "φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81" changes with time. After shifting the amplitude to the left by Δt = 0.2µs in time, the corresponding initial phase becomes "φ1 = -0.08, φ2 = -0.63, φ3 = 0.63, φ4 = 3.70", which is the same as the optimal PAPR.

[0232] In another possible implementation, based on the fact that at least two monotone signals have the same initial phase, each point of each monotone signal on the IQ plane is rotated counterclockwise by Δφ, and each monotone signal is translated Δt on the time axis. This also does not affect the maximum amplitude of the multitone signal; therefore, the translated multitone signal can also achieve the optimal PAPR. It should be noted that the order of rotation and translation of the multitone signal is not specifically limited.

[0233] For example, with N=4, the initial phases φ1 = 1.81, φ2 = 0, φ3 = 0, and φ4 = 1.81 of each monotone signal in the first polytone signal are rotated counterclockwise by Δφ = π / 6 = 0.52, and then shifted to the left on the time axis by Δt = 0.2µs. The resulting initial phases correspond to the same PAPR as the original initial phases.

[0234] It should be noted that the frequency interval between any two adjacent single-tone signals in the N single-tone signals of the first multi-tone signal is the same. For example, the frequency interval for 4 tones is 1MHz, the frequency interval for 6 tones is 0.5MHz, and the frequency interval for 8 tones is 0.5MHz; these are all specific values. It should be understood that the optimal initial phase in the above implementation also applies to other frequency intervals.

[0235] In one possible implementation, taking N=4 tones as an example, the optimal initial phase for a multi-tone signal (frequency interval 1MHz) with frequencies of -1.5 MHz, -0.5 MHz, 0.5 MHz, and 1.5 MHz also applies to a multi-tone signal (frequency interval 2MHz) with frequencies of -3 MHz, -1 MHz, 1 MHz, and 3 MHz. This is because the time axis of each tone can be simultaneously scaled down or scaled up, which is equivalent to multiplying the frequency of each tone by the same factor. The corresponding time axis of the multi-tone signal is also scaled down or scaled up in the same way. This change in the time axis does not change the maximum amplitude of the multi-tone signal, thus obtaining the same optimal PAPR value.

[0236] It should be noted that the frequencies of all notes in the above implementations are symmetrical about 0 Hz. It should also be understood that the optimal initial phase in the above implementations also applies to frequencies that are not symmetrical about 0 Hz.

[0237] In another possible implementation, taking N=4 tones as an example, the optimal initial phase for a multi-tone signal (frequency interval 1 MHz) with frequencies of -1.5 MHz, -0.5 MHz, 0.5 MHz, and 1.5 MHz also applies to a multi-tone signal (frequency interval 1 MHz) with frequencies of -1 MHz, 0 MHz, 1 MHz, and 2 MHz, meaning the overall frequency of each tone increases by 0.5 MHz. In other words, the new multi-tone signal obtained by increasing the frequency of each tone by a frequency Δf in the above implementation is also applicable to the optimal initial phase combination given above, where Δf is any value. This is because for multi-tone signals... The new polyphonic signal obtained by increasing the frequency by Δf satisfies:

[0238]

[0239] Correspondingly, the amplitude of the new polyphonic signal s' satisfies: It can be seen that the amplitude of the new polyphonic signal s' is the same as the amplitude of the polyphonic signal s before the transformation. Therefore, in the above implementation method, the optimal initial phase combination of the polyphonic signal s before the transformation is also applicable to the new polyphonic signal s'.

[0240] It should be noted that the above example of N=4 notes is only for the purpose of understanding the scheme and should not constitute any limitation on the technical solution of this application.

[0241] According to the technical solution of this application, the design of the initial phase combination and the corresponding design of the multi-tone signal waveform are provided. For multi-tone signals used in low-power narrowband devices for AoA / AoD and MCPD ranging, the technical solution of this application can provide a variety of initial phase combinations for each tone to achieve optimal PAPR. By designing different initial phases of the multi-tone signal, the average power of the multi-tone signal transmission can be improved, thereby increasing the transmission distance or coverage of the multi-tone signal.

[0242] According to the scheme provided in this application, by changing the initial phase to design different multi-tone signals, the PAPR of the signal is made as small as possible, thereby increasing the average power of the multi-tone signal transmission, which is beneficial to increasing the transmission distance or coverage of the multi-tone signal.

[0243] It should be understood that, compared to traditional multi-tone signals with an initial phase of 0 by default, the multi-tone signal provided in this application has an increased average transmission power, thereby increasing the signal transmission distance (or coverage). For example, if two devices use multi-tone signals with an initial phase of 0, they may be unable to perform multi-tone ranging or multi-tone AoA / AoD measurements due to the weak received signal.

[0244] The above text combined Figures 1 to 27 The present application describes in detail the multi-tone signal transmission method and its embodiments. The following will be combined with... Figure 28 and Figure 29 This application describes the device-side embodiments in detail. It should be understood that the descriptions of the device embodiments correspond to each other, and therefore, any parts not described in detail can be referred to the preceding device embodiments.

[0245] Figure 28 This is a schematic block diagram of a multi-tone signal transmitting device provided in an embodiment of this application. Figure 28 As shown, the device 2000 may include a transceiver unit 2010 and a processing unit 2020. The transceiver unit 2010 can communicate with the outside world, and the processing unit 2020 is used for data processing. The transceiver unit 2010 may also be referred to as a communication interface or transceiver unit.

[0246] In one possible design, the device 2000 can implement the steps or processes corresponding to those performed by the transmitting device in the above device embodiment, wherein the processing unit 2020 is used to perform processing-related operations of the transmitting device in the above device embodiment, and the transceiver unit 2010 is used to perform transceiver-related operations of the transmitting device in the above device embodiment.

[0247] In another possible design, the device 2000 can implement the steps or processes corresponding to those performed by the receiving device in the above device embodiment, wherein the transceiver unit 2010 is used to perform the transceiver-related operations of the receiving device in the above device embodiment, and the processing unit 2020 is used to perform the processing-related operations of the receiving device in the above device embodiment.

[0248] It should be understood that the device 2000 here is embodied in the form of a functional unit. The term "unit" here can refer to an application-specific integrated circuit (ASIC), electronic circuitry, a processor (e.g., a shared processor, a proprietary processor, or a group processor, etc.) and memory for executing one or more software or firmware programs, integrated logic circuitry, and / or other suitable components supporting the described functions. In an alternative example, those skilled in the art will understand that the device 2000 may specifically be a transmitting end in the above embodiments, used to execute the various processes and / or steps corresponding to the transmitting end in the above device embodiments; or, the device 2000 may specifically be a receiving end in the above embodiments, used to execute the various processes and / or steps corresponding to the receiving end in the above device embodiments. To avoid repetition, further details are omitted here.

[0249] The apparatus 2000 of each of the above-described schemes has the function of implementing the corresponding steps performed by the transmitting end in the above-described apparatus, or the apparatus 2000 of each of the above-described schemes has the function of implementing the corresponding steps performed by the receiving end in the above-described apparatus. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions; for example, the transceiver unit can be replaced by a transceiver (e.g., the transmitting unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as processing units, can be replaced by processors, respectively executing the transceiver operations and related processing operations in each apparatus embodiment.

[0250] Furthermore, the aforementioned transceiver unit can also be a transceiver circuit (e.g., it may include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit. In embodiments of this application, Figure 28 The device mentioned can be the receiving end or transmitting end in the foregoing embodiments, or it can be a chip or a chip system, such as a system on a chip (SoC). The transceiver unit can be an input / output circuit or a communication interface. The processing unit is a processor, microprocessor, or integrated circuit integrated on the chip. No limitations are imposed here.

[0251] Figure 29 A multi-tone signal transmitting device 3000 according to an embodiment of this application is shown. For example... Figure 29 As shown, the device 3000 includes a processor 3010 and a transceiver 3020. The processor 3010 and the transceiver 3020 communicate with each other through an internal connection path. The processor 3010 is used to execute instructions to control the transceiver 3020 to send and / or receive signals.

[0252] Optionally, the device 3000 may further include a memory 3030, which communicates with the processor 3010 and the transceiver 3020 via an internal connection path. The memory 3030 is used to store instructions, and the processor 3010 can execute the instructions stored in the memory 3030.

[0253] In one possible implementation, the apparatus 3000 is used to implement the various processes and steps corresponding to the transmitting device in the above apparatus embodiments.

[0254] In another possible implementation, the apparatus 3000 is used to implement the various processes and steps corresponding to the receiving device in the above apparatus embodiments.

[0255] It should be understood that the device 3000 can specifically be the transmitting end or receiving end in the above embodiments, or it can be a chip or a chip system. Correspondingly, the transceiver 3020 can be the transceiver circuit of the chip, which is not limited here. Specifically, the device 3000 can be used to execute the various steps and / or processes corresponding to the transmitting end or receiving end in the above device embodiments.

[0256] Optionally, the memory 3030 may include read-only memory and random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 3010 may be used to execute instructions stored in the memory, and when the processor 3010 executes instructions stored in the memory, the processor 3010 is used to perform the various steps and / or processes of the device embodiments corresponding to the transmitting end or receiving end described above.

[0257] In implementation, each step of the above-described device can be completed through integrated logic circuits in the processor's hardware or through software instructions. The steps of the device disclosed in the embodiments of this application can be directly manifested as execution by a hardware processor, or as a combination of hardware and software modules within the processor. The software modules can reside in mature storage media in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above-described device. To avoid repetition, detailed descriptions are omitted here.

[0258] It should be noted that the processor in the embodiments of this application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-described device embodiments can be completed by the integrated logic circuitry in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The processor in the embodiments of this application can implement or execute the various devices, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the device disclosed in the embodiments of this application can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above-described device.

[0259] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and apparatuses described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0260] According to the apparatus provided in the embodiments of this application, this application also provides a computer program product, which includes computer program code, which, when run on a computer, causes the computer to execute the apparatus in the embodiments shown above.

[0261] According to the apparatus provided in the embodiments of this application, this application also provides a computer-readable medium storing program code that, when run on a computer, causes the computer to execute the apparatus in the embodiments shown above.

[0262] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different devices to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0263] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing device embodiments, and will not be repeated here.

[0264] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and apparatuses can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0265] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0266] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0267] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the apparatus described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, random access memory, magnetic disks, or optical disks.

[0268] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for transmitting multi-tone signals, characterized in that, include: Generate a first multi-tone signal, which includes N single-tone signals, each single-tone signal having the same amplitude value, at least two of the N single-tone signals having the same initial phase, and the at least two single-tone signals having the same initial phase being symmetrical about the center frequency point, where N is an integer greater than or equal to 2; Send the first multi-tone signal; When N=8, the initial phases of the N single-tone signals satisfy any one of the following: φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ4 = 0, φ5 = 0, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40; or, φ1 = 0.88, φ2 = 2.45, φ3 = 5.37, φ4 = 0, φ5 = 0, φ6 = 5.37, φ7 = 2.45, φ8 = 0.88; Wherein, φ1 is the initial phase of the first monotone signal, φ2 is the initial phase of the second monotone signal, φ3 is the initial phase of the third monotone signal, φ4 is the initial phase of the fourth monotone signal, φ5 is the initial phase of the fifth monotone signal, φ6 is the initial phase of the sixth monotone signal, φ7 is the initial phase of the seventh monotone signal, and φ8 is the initial phase of the eighth monotone signal.

2. The method according to claim 1, characterized in that, When N=4, the initial phase of the single-tone signal satisfies one or more of the following: The first and fourth single-tone signals have the same initial phase; or, The second and third single-tone signals have the same initial phase; Among them, the first monotone signal has the smallest frequency, the fourth monotone signal has the largest frequency, and the second monotone signal has a frequency greater than that of the first monotone signal and less than that of the third monotone signal.

3. The method according to claim 1, characterized in that, When N=8, the first monotone signal has the lowest frequency, the eighth monotone signal has the highest frequency, the third monotone signal has a higher frequency than the second monotone signal and a lower frequency than the fourth monotone signal, the fifth monotone signal has a higher frequency than the fourth monotone signal and a lower frequency than the sixth monotone signal, and the sixth monotone signal has a lower frequency than the seventh monotone signal.

4. The method according to claim 1, characterized in that, When N=4, the initial phases of the N single-tone signals satisfy any of the following: φ2=φ3=0,1.59 ≤ φ1<1.86,φ4 ≥ - φ1 + 3.57,and φ4 ≤ - φ1 4 / 9 + 2.69; φ2=φ3=0, 1.86 ≤ φ1 ≤ 1.98, φ4 ≥ - φ1 + 3.57, and φ4 ≤ - φ1 9 / 4 +6.04; φ2=φ3=0, 4.3 ≤ φ1<4.42, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 9 / 4 + 14.36; φ2=φ3=0, 4.42 ≤ φ1<4.69, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 4 / 9 + 6.38; φ2=φ3=0,0 ≤ φ1<2.05,φ4 ≥ - φ1 + π,and φ4 ≤ - φ1 0.53 + π; φ2=φ3=0, 2.05 ≤ φ1 ≤ π, φ4 ≥ - φ1 + π, and φ4 ≤ - φ1 1.88 + 5.9; φ2=φ3=0,π ≤ φ1<4.23,φ4 ≤ - φ1 + 9.42,and φ4 ≥ - φ1 1.88 + 12.18; φ2=φ3=0, 4.23 ≤ φ1 ≤ 2π, φ4 ≤ - φ1 + 9.42, and φ4 ≥ - φ1 0.53 +6.47; φ2=φ3=0,0 ≤ φ1<2.3,φ4 ≥ - φ1 + 2.92,and φ4 ≤ - φ1 0.46 + 3.36; φ2=φ3=0,2.3 ≤ φ1<2.92,φ4 ≥ - φ1 + 2.92,and φ4 ≤ - φ1 2.17 + 7.29; φ2=φ3=0,2.92 ≤ φ1<3.36,φ4 ≥ 0,and φ4 ≤ - φ1 2.17 + 7.29; φ2=φ3=0, 2.92 ≤ φ1<3.36, φ4 ≤ 2π, and φ4 ≥ - φ1 2.17 + 12.62; φ2=φ3=0,3.36 ≤ φ1<3.98,φ4 ≤ - φ1 + 9.64,and φ4 ≥ - φ1 2.17 +12.62; or, φ2=φ3=0,3.98 ≤ φ1<2π,φ4 ≤ - φ1 + 9.64,and φ4 ≥ - φ1 0.46 + 5.81; Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

5. The method according to claim 4, characterized in that, When N=4, φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81; or, φ1 = 4.47, φ2 = 0, φ3 = 0, φ4 = 4.

47.

6. The method according to any one of claims 1 to 5, characterized in that, The frequency interval between any two adjacent monotone signals in the N monotone signals is the same.

7. The method according to claim 6, characterized in that, When N=4, the frequency interval between any two adjacent single-tone signals among the N single-tone signals is 1MHz.

8. The method according to claim 4, characterized in that, When N=4, The first monotone signal has a frequency of -1.5 MHz, the second monotone signal has a frequency of -0.5 MHz, the third monotone signal has a frequency of 0.5 MHz, and the fourth monotone signal has a frequency of 1.5 MHz; or, The frequency of the first monotone signal is -1 MHz, the frequency of the second monotone signal is 0 MHz, the frequency of the third monotone signal is 1 MHz, and the frequency of the fourth monotone signal is 2 MHz.

9. The method according to claim 4, characterized in that, When N=4, the frequency interval between any two adjacent single-tone signals among the N single-tone signals is 2MHz.

10. The method according to claim 4, characterized in that, When N=4, The frequency of the first monotone signal is -3MHz, the frequency of the second monotone signal is -1MHz, the frequency of the third monotone signal is 1MHz, and the frequency of the fourth monotone signal is 3MHz.

11. A multi-tone signal transmitting device, characterized in that, include: The processing unit is used to generate a first multi-tone signal, which includes N single-tone signals, each single-tone signal having the same amplitude value, at least two of the N single-tone signals having the same initial phase, and the at least two single-tone signals having the same initial phase being symmetrical about the center frequency point, where N is an integer greater than or equal to 2. Transceiver unit, used to transmit the first multi-tone signal; When N=8, the initial phases of the N single-tone signals satisfy any one of the following: φ1 = 5.40, φ2 = 3.84, φ3 = 0.91, φ4 = 0, φ5 = 0, φ6 = 0.91, φ7 = 3.84, φ8 = 5.40; or, φ1 = 0.88, φ2 = 2.45, φ3 = 5.37, φ4 = 0, φ5 = 0, φ6 = 5.37, φ7 = 2.45, φ8 = 0.88; Wherein, φ1 is the initial phase of the first monotone signal, φ2 is the initial phase of the second monotone signal, φ3 is the initial phase of the third monotone signal, φ4 is the initial phase of the fourth monotone signal, φ5 is the initial phase of the fifth monotone signal, φ6 is the initial phase of the sixth monotone signal, φ7 is the initial phase of the seventh monotone signal, and φ8 is the initial phase of the eighth monotone signal.

12. The apparatus according to claim 11, characterized in that, When N=4, the initial phase of the single-tone signal satisfies one or more of the following: The first and fourth single-tone signals have the same initial phase; or, The second and third single-tone signals have the same initial phase; Among them, the first monotone signal has the smallest frequency, the fourth monotone signal has the largest frequency, and the second monotone signal has a frequency greater than that of the first monotone signal and less than that of the third monotone signal.

13. The apparatus according to claim 11, characterized in that, When N=8 Among them, the first monotone signal has the smallest frequency, the eighth monotone signal has the largest frequency, the third monotone signal has a frequency greater than the second monotone signal and less than the fourth monotone signal, the fifth monotone signal has a frequency greater than the fourth monotone signal and less than the sixth monotone signal, and the sixth monotone signal has a frequency less than the seventh monotone signal.

14. The apparatus according to claim 11, characterized in that, When N=4, the initial phases of the N single-tone signals satisfy any of the following: φ2=φ3=0,1.59 ≤ φ1<1.86,φ4 ≥ - φ1 + 3.57,and φ4 ≤ - φ1 4 / 9 + 2.69; φ2=φ3=0, 1.86 ≤ φ1 ≤ 1.98, φ4 ≥ - φ1 + 3.57, and φ4 ≤ - φ1 9 / 4 +6.04; φ2=φ3=0, 4.3 ≤ φ1<4.42, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 9 / 4 + 14.36; φ2=φ3=0, 4.42 ≤ φ1<4.69, φ4 ≤ - φ1 + 8.99, and φ4 ≥ - φ1 4 / 9 + 6.38; φ2=φ3=0,0 ≤ φ1<2.05,φ4 ≥ - φ1 + π,and φ4 ≤ - φ1 0.53 + π; φ2=φ3=0, 2.05 ≤ φ1 ≤ π, φ4 ≥ - φ1 + π, and φ4 ≤ - φ1 1.88 + 5.9; φ2=φ3=0,π ≤ φ1<4.23,φ4 ≤ - φ1 + 9.42,and φ4 ≥ - φ1 1.88 + 12.18; φ2=φ3=0, 4.23 ≤ φ1 ≤ 2π, φ4 ≤ - φ1 + 9.42, and φ4 ≥ - φ1 0.53 +6.47; φ2=φ3=0,0 ≤ φ1<2.3,φ4 ≥ - φ1 + 2.92,and φ4 ≤ - φ1 0.46 + 3.36； φ2=φ3=0,2.3 ≤ φ1<2.92,φ4 ≥ - φ1 + 2.92,and φ4 ≤ - φ1 2.17 + 7.29; φ2=φ3=0,2.92 ≤ φ1<3.36,φ4 ≥ 0,and φ4 ≤ - φ1 2.17 + 7.29; φ2=φ3=0, 2.92 ≤ φ1<3.36, φ4 ≤ 2π, and φ4 ≥ - φ1 2.17 + 12.62; φ2=φ3=0,3.36 ≤ φ1<3.98,φ4 ≤ - φ1 + 9.64,and φ4 ≥ - φ1 2.17 +12.62; or, φ2=φ3=0,3.98 ≤ φ1<2π,φ4 ≤ - φ1 + 9.64,and φ4 ≥ - φ1 0.46 + 5.81； Wherein, φ1 is the initial phase of the first single-tone signal, φ2 is the initial phase of the second single-tone signal, φ3 is the initial phase of the third single-tone signal, and φ4 is the initial phase of the fourth single-tone signal.

15. The apparatus according to claim 14, characterized in that, When N=4, φ1 = 1.81, φ2 = 0, φ3 = 0, φ4 = 1.81; or, φ1 = 4.47, φ2 = 0, φ3 = 0, φ4 = 4.

47.

16. The apparatus according to any one of claims 11 to 15, characterized in that, The frequency interval between any two adjacent monotone signals in the N monotone signals is the same.

17. The apparatus according to claim 16, characterized in that, When N=4, the frequency interval between any two adjacent single-tone signals among the N single-tone signals is 1MHz.

18. The apparatus according to claim 14, characterized in that, When N=4, The first monotone signal has a frequency of -1.5 MHz, the second monotone signal has a frequency of -0.5 MHz, the third monotone signal has a frequency of 0.5 MHz, and the fourth monotone signal has a frequency of 1.5 MHz; or, The frequency of the first monotone signal is -1 MHz, the frequency of the second monotone signal is 0 MHz, the frequency of the third monotone signal is 1 MHz, and the frequency of the fourth monotone signal is 2 MHz.

19. The apparatus according to claim 14, characterized in that, When N=4, the frequency interval between any two adjacent single-tone signals among the N single-tone signals is 2MHz.

20. The apparatus according to claim 14, characterized in that, When N=4, The frequency of the first monotone signal is -3MHz, the frequency of the second monotone signal is -1MHz, the frequency of the third monotone signal is 1MHz, and the frequency of the fourth monotone signal is 3MHz.

21. A multi-tone signal transmitting device, characterized in that, include: At least one processor, said at least one processor being coupled to memory; The at least one processor is configured to execute a computer program stored in the memory to cause the apparatus to perform the method as described in any one of claims 1 to 10.

22. A chip, characterized in that, include: At least one processor is configured to retrieve and run a computer program from memory, causing a communication device on which the chip is mounted to perform the method as described in any one of claims 1 to 10.

23. A computer-readable storage medium, characterized in that, include: The computer-readable storage medium stores a computer program that, when executed, causes the computer to perform the method as described in any one of claims 1 to 10.

24. A computer program product, characterized in that, The computer program product includes computer program code that, when executed, causes the method as described in any one of claims 1 to 10 to be implemented.

Images